It's approximately one million times more acceptable than being told that the people of Britain are basically children and we should just be ignored.
As someone else pointed out, political parties use dishonest and misleading campaign material. Should we abolish voting in general elections too?
Instead of "Project Fear", the new catch-all is "patronising." When your arguments are inherently impossible to logically disprove, they are meaningless arguments: this applies to 'patronising' as much as it did to 'Project Fear'.
The people of Britain have been lied to and misled. This does not make them stupid; it does not make them children; it does not make them idiots; and even if any of these things were the case it would not make it untrue. People are human, and we tend to believe what we want to believe and, particularly, what we have been primed to believe by what we are reading. Everyone is susceptible to it, but that does not make it justified and it does not make it impossible to look at the claims from a more objective point of view.
What you are attempting to do is justify a campaign of dishonesty, deceit and dog-whistle politics on the questionable premise that questioning that campaign is insulting to the British people. Such arguments are an insult to our liberal democracy, which is built on honest politics conducted in good faith. The Vote Leave campaign engaged in neither, and simply played on people's fears.
I understand that you got what you wanted and you want to keep it that way, but that does not change the truth of any of what I am saying.